<?xml version='1.0' encoding='UTF-8'?>

<xs:schema
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    targetNamespace='http://etherx.jabber.org/streams'
    xmlns='http://etherx.jabber.org/streams'
    elementFormDefault='unqualified'>

  <xs:import namespace='jabber:client'/>
  <xs:import namespace='jabber:server'/>
  <xs:import namespace='urn:ietf:params:xml:ns:xmpp-sasl'/>
  <xs:import namespace='urn:ietf:params:xml:ns:xmpp-streams'/>
  <xs:import namespace='urn:ietf:params:xml:ns:xmpp-tls'/>

  <xs:element name='stream'>
    <xs:complexType>
      <xs:sequence xmlns:client='jabber:client'
                   xmlns:server='jabber:server'>
        <xs:element ref='features' 
                    minOccurs='0' 
                    maxOccurs='1'/>
        <xs:any namespace='urn:ietf:params:xml:ns:xmpp-tls'
                minOccurs='0'
                maxOccurs='1'/>
        <xs:any namespace='urn:ietf:params:xml:ns:xmpp-sasl'
                minOccurs='0'
                maxOccurs='1'/>
        <xs:any namespace='##other'
                minOccurs='0'
                maxOccurs='unbounded'
                processContents='lax'/>
        <xs:choice minOccurs='0' maxOccurs='1'>
          <xs:choice minOccurs='0' maxOccurs='unbounded'>
            <xs:element ref='client:message'/>
            <xs:element ref='client:presence'/>
            <xs:element ref='client:iq'/>
          </xs:choice>
          <xs:choice minOccurs='0' maxOccurs='unbounded'>
            <xs:element ref='server:message'/>
            <xs:element ref='server:presence'/>
            <xs:element ref='server:iq'/>
          </xs:choice>
        </xs:choice>
        <xs:element ref='error' minOccurs='0' maxOccurs='1'/>
      </xs:sequence>
      <xs:attribute name='from' type='xs:string' use='optional'/>
      <xs:attribute name='id' type='xs:string' use='optional'/>
      <xs:attribute name='to' type='xs:string' use='optional'/>
      <xs:attribute name='version' type='xs:decimal' use='optional'/>
      <xs:attribute ref='xml:lang' use='optional'/>
      <xs:anyAttribute namespace='##other' processContents='lax'/> 
    </xs:complexType>
  </xs:element>

  <xs:element name='features'>
    <xs:complexType>
      <xs:sequence>
        <xs:any namespace='##other'
                minOccurs='0'
                maxOccurs='unbounded'
                processContents='lax'/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name='error'>
    <xs:complexType>
      <xs:sequence  xmlns:err='urn:ietf:params:xml:ns:xmpp-streams'>
        <xs:group   ref='err:streamErrorGroup'/>
        <xs:element ref='err:text'
                    minOccurs='0'
                    maxOccurs='1'/>
        <xs:any     namespace='##other'
                    minOccurs='0'
                    maxOccurs='1'
                    processContents='lax'/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>
